Upcycle pruned branches into coat hooks. No directions; was a 'for sale' item . but could use pallets for the frame. Make sure branch sections are well dried. Pre-drill branch and frame. Use wood glue and screws (or pegs) to connect.
This is a perfect combo of my two favorite ideas for that space under the stairs leading to the basement. A reading nook AND book storage and shelves . assuming that there is enough space for this there.